Engineering Thermodynamics MCQ Questions & Answers | Mechanical Engineering

Addition of heat at constant pressure to a gas results in Raising its temperature and doing external work
When you heat a gas, both its vapor pressure and the volume it occupies increase. The individual gas particles become more energetic and the temperature of the gas increases.

Heat and work are path functions because they depend on how a sysem changes from initial to final state, hence they are state functions.
Thermal conductivity is mainly a function of the motion of the free electrons therefore property of a material, not a path function.

According to the Carnot theorem, no engine operating between two constant temperature reservoirs can be more efficient than a Carnot engine operating between the same reservoirs. This means that achieving the same efficiency as the Carnot cycle with an actual engine is impossible, as it would violate the second law of thermodynamics.

Therefore, the correct completion is: "An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is Impossible."

Correct Option is (B)
The lower the temperature, the lower the pressure inside of the sphere.
If the exact values were plotted out, a linear relationship would be apparent.
Extrapolating this line to the point where there would be no pressure yields absolute zero, which is about -273.15 degrees Celsius.

A homogeneous thermodynamic system is defined as the one whose chemical composition and physical properties are the same in all parts of the system, or change continuously from one point to another.
An example of a heterogeneous system is water with ice floating in it. This system has two homogeneous bodies, water and ice. The chemical composition of the two phases is the same, but their physical properties differ drastically

The entropy (S) is a thermodynamic property that quantifies the degree of disorder or randomness in a system. It can be expressed as a function of various thermodynamic parameters. Option D, All of these, is the correct choice because entropy can indeed be expressed as a function of pressure and temperature, temperature and volume, as well as heat and work.

Entropy as a function of pressure and temperature (S = f(P, T)) is applicable in various processes such as isothermal processes, isobaric processes, and adiabatic processes where pressure and temperature changes occur simultaneously.

Entropy as a function of temperature and volume (S = f(T, V)) is relevant in processes like isentropic processes, where temperature and volume variations are significant.

Entropy as a function of heat and work (S = f(Q, W)) is applicable in thermodynamic cycles such as the Carnot cycle, where the heat transfer (Q) and work done (W) are crucial parameters.

Therefore, Option D correctly encompasses all these possibilities, making it the most suitable choice.

A molecule consisting of one atom is known as Mono-atomic
In the gaseous phase at sufficiently high temperatures, all the chemical elements are monatomic gases.

One molecule of oxygen consists of two atoms of oxygen.
Normally two oxygen atoms (denoted O); three bonded atoms of oxygen are called ozone (O)